Sewing wire for flat rope



April 15, 1930. R, NLTscH v1,755,018

Filed May 51, 1929 ATTORNEY Patented Apr. Al5, 1930 UNTED STATES TENT oFFlcE RICHARD NirsoH, or` wannnn, Amarina SEWING WIRE FOR FLAT Application leglV May 31, 1929` Serial No. 367,456.

This invention relates to wire ropes or cables of the flat type and more particularly to the sewing wires used in constructing suchv is a low grade open hearth single or double annealed steel wire.

The number and size of sewing wire used depends upon the size of the fiat rope to be made and it varies in size from :#:20 to #16 i and in number of wires from 10 to 16.

The strand wires of the rope being of higher grade metal, such as steel, nick the sewing wires and cause them, under the strain produced by the load, to rapidly break and result in splitting the rope necessitating frequent resewing of the rope. Bad sheaves and hoist reel conditions also cause the same effect.

A primary object of this invention is to overcome these objections and defects and provide a rope or cable in which danger ot sudden breakage is eliminated and in which the necessity of resewing is reduced to a mini mum and the life of the rope greatly prolonged.

Another object is to so produce sewing Wires :tor use in the manufacture of flat wire cables or ropes that a soft wire bed will be formed between the hard strand wires of the rope and the hard cores of the sewing wires, even after the soft sewing wires are nicked and broken since the stubs of such soft wires l'emain inside of the strands and the rope remains compact allowing the strands to be used for resewing without damage from internal nicking.

Another object of the invention provides a composite sewing wire for use in manufacturing flat metal ropes or cables constructed with a hard metal core incased in soft wires thereby avoiding internal nicking of the wires and prolonging the life of the cable.

In carrying out these objects, the invention is susceptible of a wide range of modification without departing Yfrom the spirit or sacriflcing anyl oi the advantages of the claimed in- .ventiong therebeing shown in the drawings for illustrative purposes a preferred and practical form, in which:

Figure l represents a side elevation of a piece ot flat rope manufactured with the sewing wires constituting this invention;

Fig.k 2 is atop plan view thereof;

Fig. 3 is a longitudinal4 section taken on the line, 3--3 0f Fgl? Fig` 4 isa transverse section taken on the line44 otFig. l; Y s

Fig. 5 is a detail longitudinal section showing a slightly different form of sewing wire.

ln the embodiment illustrated a `Hat metal rope is shown at l composed of a plurality oli longitudinally extendingistrand Wires 2 which may be composed oi any desired number of wires depending uponthe flexibility of; the cable to be manufactured. These strands` 2 are laid right and lett lay altermately, the number of strands depending upon the required width and strength of the cable.

. .'Ifhe strands 2 are sewed or laced with a strand of sewing wire 3 which constitutes the present invention, This sewing wire 3 1s a composite wire being'constructed of a com` bination of sott and hard wires the number ot `which may vary in respective strands pro- .vided that the hard Wires shown at 4, two

being` here illustrated, do not exceed one-half vthe number ot wires used in making up the sewing strand.` These hard wires 4 are preferably made of hi ghy grade cast steel and have tor-med around them a bed of soft wires 5 which protect the hard wires 4 which constitute practically a core for the strand 3,

against nicking or by the hard wires which term the strand 2 of the cable. The hard wires 4 constituting the sewing wire core are of a diameter not to exceed that of the soft wires 5 as shown in Fig. 3 and are preferably made of less diameter as shown at 4a in Fig. 5. It is of course understood that owing to the diierent sizes of iinished rope required the numbers and the diameters of the sewing or lacing Wires will also necessarily vary a0- cording to the type of the finished rope.

From the above description it will be seen that the soft wire strands 5 of the sewing wires 3 form a bed between the wires used in the manufacture of the strands of the rope and the cast steel core wires 4 of the sewing wire even after the soft sewing wires 5 have been nicked and broken. The stubs remain inside the rope strands whereby the rope strands remain compact and in this way eliminate any danger of sudden rope breakage due to internal nicking of the wires in the strand. The strands may also be used for resewing without damage from internal nicking.

The use of these composite sewing wires will at least double the amount of tonnage hoisted by the cable before resewing is required. Ropes sewed by these composite wires will also provide at least. double service over those sewn with wires as now made even although the sheave wheels are badly grooved or if the hoist reels of sheave shafts are out of line.

Without further description it is thought that the features and advantages of the invention will be readily apparent to those skilled in theart, and it will, of course, be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit of the invention or its scope as claimed. I claim:

1. A composite sewing strand or lacing for metal rope composed of hard and soft wires one embedded in the other.

2. A composite sewin strand or lacing for metal rope composed o hard and soft wires, the soft wires being positioned outside the hard wires and arranged to form a bedding for the hard wires to protect them from cutting contact with the strands of the rope when in use.

3. A composite sewing strand or lacing for metal rope composed of hard and soft wires,

the soft wires being arranged to forma bedding for the hard wires to protect them from cutting contact with the strands of the rope when in use, the hard wires being of less diameterrthan the soft wires whereby the hard wires are protected against cutting contact with the hard wires of the rope strand.

RICHARD NITSCH. 

